CN103618336B - The output digital modulation circuit of rectifier type High Frequency Link combining inverter and control system - Google Patents
The output digital modulation circuit of rectifier type High Frequency Link combining inverter and control system Download PDFInfo
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Abstract
The present invention discloses a kind of output digital modulation circuit and control system of rectifier type High Frequency Link combining inverter, and circuit comprises input voltage U
in, Sine Modulated high-frequency chain inverter, high-frequency isolation transformer, synchronous rectifier, power frequency inverter and LCL filter.Control system comprises voltage sensor, current sensor and DSP digitial controller.Wherein, Sine Modulated high-frequency chain inverter is made up of four power MOSFETs; The former limit of high-frequency isolation transformer and secondary are all simplex winding structure; Synchronous rectifier is made up of four insulated gate bipolar transistor IGBTs and anti-also diode; Power frequency inverter is also made up of four insulated gate bipolar transistor IGBTs and anti-also diode; LCL filter is by inductance L
1, L
2form with electric capacity C.The high frequency electrical isolation present invention achieves input, exporting, has little, the lightweight advantage of volume, is highly suitable for grid-connected photovoltaic system.
Description
Technical field
The present invention relates to a kind of output digital modulation circuit and control system of rectifier type High Frequency Link combining inverter, belong to converters and control technology field thereof.
Background technology
The day by day exhausted of fossil energy needs us to find suitable fungible energy source, and solar energy is a kind of inexhaustible green energy resource, and photovoltaic cell capable of generating power is a kind of effective ways utilizing solar energy.And photovoltaic cell output voltage affects comparatively large by Changes in weather, its fluctuation range causes certain difficulty to effectively utilizing solar electric power.At present, by combining inverter, electric energy being delivered directly to electrical network is a kind of comparatively general method.
If adopt the electrical energy changer of non-electrical isolation, due to the direct-to-ground capacitance effect of photovoltaic cell, converter is that common mode current provides low-impedance circulation path, causes in grid-connected current and contains relatively large leakage current, make grid-connected current quality can not meet the requirement of relevant criterion.At present, in order to overcome the problem of grid-connected leakage current, have two kinds of methods, one is the circuit structure improving non-isolation type combining inverter, and another is the High Frequency Link combining inverter adopting high-frequency isolation.The circuit structure improving non-isolation type combining inverter by increasing switching tube reduces the size of common-mode voltage, thus reduce the size of leakage current, although the method can realize efficient, high-quality grid-connected, but due to exist safety problem and input, outlet side voltage matches problem, its application is still subject to certain restrictions.High-frequency chain inverter achieves the electrical isolation between photovoltaic cell and electrical network, cut off the circulation path of common mode current, high frequency transformer increases limited on volume and weight, but solves input, problem that output voltage matches, therefore, high-frequency chain inverter is widely used.
Compared to the High Frequency Link combining inverter adopting circuit of reversed excitation, forward converter to form, bridge circuit is that the high-frequency chain inverter of basic structure can process larger power, therefore applies also more extensive.
Bridge-type High Frequency Link combining inverter mainly contains three kinds of structures: the DC/DC conversion device+bridge-type inverter one, being with high-frequency isolation; Two, high-frequency inverter+high frequency transformer+frequency converter; Three, high-frequency inverter+high frequency transformer+synchronous rectifier+bridge-type inverter.
In foregoing circuit structure, the first control program by the photovoltaic cell of instability the pressure that generates electricity obtain through high-frequency isolation the VD that matches with output voltage, then obtain sinusoidal voltage through bridge-type inverter sinusoidal pulse width modulation.The method advantage is can optimal control, and the MPPT maximum power point tracking of photovoltaic cell can be realized by the DC/DC conversion device of the high-frequency isolation of prime, and grid-connected current waveform quality is realized by the bridge-type inverter of rear class; But also there is obvious shortcoming in this converter, namely the direct current LC filter that preceding stage high frequency isolation DC/DC conversion device needs quality, volume all larger just can obtain the good direct current of quality, further, the life-span of DC filtering electrochemical capacitor also becomes a decisive factor in restriction converter life-span; In addition, in this kind of control program, all switching tubes are all operated in high frequency state, compare and are difficult to realize Sofe Switch.The cost that all these characteristics determine this control program is higher, and converter volume, weight are comparatively large, and conversion efficiency is also lower.
Compared with the first control program, the second control program eliminates direct voltage link, adopt frequency converter directly high-frequency alternating current to be transformed to industrial-frequency alternating current, also eliminate volume, direct current LC filter that weight is larger thus, conversion efficiency is improved; But what frequency converter adopted is bidirectional switch, and the quantity of switching device does not reduce, and all switching tubes all must operate at high-frequency work, are difficult to further raising efficiency.
The third control program directly removes the direct current LC filter in the first scheme, in addition, for convenience of AC energy feedback, the diode rectifier circuit in the DC/DC conversion device of high-frequency isolation is changed into the circuit of synchronous rectification that full control device is formed.If Sine Modulated performs in the inverter of rear class, this control program obtains high-frequency direct-current square-wave voltage jaggy at synchronous rectifier output, so this breach voltage can produce larger impact to the quality of inverter output voltage waveform, and, the same with the second control program, all switching devices all work in high frequency, and efficiency is difficult to improve.
Therefore, find suitable circuit structure and corresponding modulation strategy to improve the performance of high-frequency chain inverter, raise the efficiency to realize being necessary, this programme produces thus.
Summary of the invention
Goal of the invention: for problems of the prior art with not enough, the invention provides a kind of output digital modulation circuit and control system of rectifier type High Frequency Link combining inverter, improve the conversion efficiency of high-frequency chain inverter, reduce the cooling requirements of inverter, ensure high-quality output characteristic.
Technical scheme: a kind of output digital modulation circuit of rectifier type High Frequency Link combining inverter, comprises input voltage U
in, Sine Modulated high-frequency chain inverter, high-frequency isolation transformer, synchronous rectifier, LCL filter.
Sine Modulated high-frequency chain inverter comprises the first switching tube, second switch pipe, the 3rd switching tube and the 4th switching tube of being with anti-also diode, the source electrode of the first switching tube is connected with the drain electrode of the 3rd switching tube, the source electrode of second switch pipe is connected with the drain electrode of the 4th switching tube, and the drain electrode of the first switching tube connects the drain electrode of second switch pipe, the source electrode of the 3rd switching tube connects the source electrode of the 4th switching tube; The positive pole of input power is connected between the drain electrode of the first switching tube and the drain electrode of second switch pipe; The negative pole of input power is connected between the source electrode of the 3rd switching tube and the source electrode of the 4th switching tube.
Synchronous rectifier comprises the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube of being with anti-also diode, the emitter of the 5th switching tube is connected with the collector electrode of the 7th switching tube, the emitter of the 6th switching tube is connected with the collector electrode of the 8th switching tube, and the collector electrode of the 5th switching tube connects the collector electrode of the 6th switching tube, the emitter of the 7th switching tube connects the emitter of the 8th switching tube.
High-frequency isolation transformer comprises former limit winding and vice-side winding, wherein transformer primary side winding is two terminals, be respectively the first terminal, the second terminal, transformer secondary winding also has two terminals, be respectively the 3rd terminal, the 4th terminal, wherein transformer the first terminal is connected between the source electrode of the first switching tube and the drain electrode of the 3rd switching tube, and transformer second connecting terminals is connected between the source electrode of second switch pipe and the drain electrode of the 4th switching tube; Transformer the 3rd connecting terminals is connected between the emitter of the 5th switching tube and the collector electrode of the 7th switching tube, and transformer the 4th connecting terminals is connected between the emitter of the 6th switching tube and the collector electrode of the 8th switching tube.
Power frequency inverter comprises is with the 9th switching tube of anti-also diode, the tenth switching tube, the 11 switching tube and twelvemo to close pipe, the emitter of the 9th switching tube is connected with the collector electrode of the 11 switching tube, the emitter of the tenth switching tube is connected with the collector electrode that twelvemo closes pipe, and the collector electrode of the 9th switching tube connects the collector electrode of the tenth switching tube, the emitter of the 11 switching tube connects the emitter that twelvemo closes pipe.In addition, in synchronous rectifier and power frequency inverter, the collector electrode of the 5th switching tube, the collector electrode of the 6th switching tube, the collector electrode of the 9th switching tube, the collector electrode of the tenth switching tube interconnect; The emitter that the emitter of the emitter of the 7th switching tube, the emitter of the 8th switching tube, the 11 switching tube, twelvemo close pipe interconnects.
In LCL filter, one end of the first inductance and the emitter of the 9th switching tube, the collector electrode of the 11 switching tube link together, and the other end of the first inductance is connected with one end of one end of filter capacitor and the second inductance; The other end of the second inductance is connected with the live wire of electrical network; The collector electrode that the emitter of the other end of filter capacitor and electrical network zero line, the tenth switching tube and twelvemo close pipe links together.
A numerical control system for rectifier type High Frequency Link combining inverter, comprises voltage sensor, current sensor and DSP digitial controller; Wherein DSP digitial controller comprises phase-locked loop, subtracter, duty-cycle loss calculating, grid-connected current adjuster, adder and signal conditioner composition;
The input of voltage sensor is connected to the two ends of above-mentioned electrical network, and current sense input and above-mentioned first inductance are in series;
The input of the output termination phase-locked loop of voltage sensor, the positive input terminal of the output termination subtracter of phase-locked loop, the output of current sensor is connected to the negative input end of subtracter and the input of duty-cycle loss computing module, the input of the output termination grid-connected current adjuster of subtracter, two inputs of adder connect the output of duty-cycle loss computing module and the output of grid-connected current adjuster respectively, the first terminal of the output termination signal conditioner of adder, second terminal of signal conditioner exports the first switching tube, second switch pipe, the drive singal of the 3rd switching tube and the 4th switching tube, 3rd terminal of signal conditioner exports the 5th switching tube, 6th switching tube, the drive singal of the 7th switching tube and the 8th switching tube, 4th terminal of signal conditioner exports the 9th switching tube, tenth switching tube, 11 switching tube and twelvemo close the drive singal of pipe.
In the numerical control system of rectifier type High Frequency Link combining inverter, first the feedback signal of voltage sensor senses line voltage is adopted, utilize digital phase-locked loop to obtain the fiducial value of the grid-connected current synchronous with line voltage, the amplitude of this fiducial value obtains according to the maximal power tracing point of generation of electricity by new energy device; Adopt current sensor to detect the first filter inductance current feedback signal, by phase-locked loop gained reference signal and the first inductor current feedback signal subtraction, obtain grid-connected current error signal, using the input signal of grid-connected current error signal as grid-connected current adjuster; Owing to there is the loss of duty ratio in main circuit, for obtaining high-quality output waveform, according to the size of inverter output current estimation duty-cycle loss, being then added with grid-connected current regulator output signal, so greatly can improving the output quality of grid-connected current.
Beneficial effect: Sine Modulated of the present invention performs in transformer primary side side inverter, the DC pulse voltage with the change of sinusoidal rule is obtained by synchronous rectifier, be industrial-frequency alternating current through power frequency inverter by pulse direct current inversion again, use in the rectifier type high-frequency chain inverter of this modulating circuit modulates, power frequency inverter breaker in middle device power frequency switch, synchronous rectifier, in power frequency inverter, all switching devices achieve zero voltage switch, high-frequency inverter breaker in middle device also can realize zero voltage switch the most of operating time in a power frequency period, greatly can improve the efficiency of high-frequency chain inverter, reduce cooling requirements, in addition, have duty-cycle loss according to synchronous rectifier output voltage and cause output voltage waveforms distortion phenomenon, according to the size of the size prediction duty-cycle loss of inverter output current, then compensate in sinusoidal modulation wave, can greatly improve the quality of inverter output waveforms.
Accompanying drawing explanation
Fig. 1 is rectifier type High Frequency Link combining inverter and the digital modulation circuit block diagram thereof of the embodiment of the present invention;
Fig. 2 is the schematic diagram of the signal conditioner signal madulation in the embodiment of the present invention in DSP digitial controller;
Fig. 3 is that the embodiment of the present invention is greater than 0 at output voltage, main oscillogram in switch periods when inductive current is greater than 0;
Fig. 4 is that the embodiment of the present invention is greater than 0 at output voltage, the fundamental diagram of mode 0 when inductive current is greater than 0;
Fig. 5 is that the embodiment of the present invention is greater than 0 at output voltage, the fundamental diagram of mode 1 when inductive current is greater than 0;
Fig. 6 is that the embodiment of the present invention is greater than 0 at output voltage, the fundamental diagram of mode 2 when inductive current is greater than 0;
Fig. 7 is that the embodiment of the present invention is greater than 0 at output voltage, the fundamental diagram of mode 3 when inductive current is greater than 0;
Fig. 8 is that the embodiment of the present invention is greater than 0 at output voltage, the fundamental diagram of mode 4 when inductive current is greater than 0;
Fig. 9 is that the embodiment of the present invention is greater than 0 at output voltage, the fundamental diagram of mode 5 when inductive current is greater than 0;
Figure 10 is that the embodiment of the present invention is greater than 0 at output voltage, the fundamental diagram of mode 6 when inductive current is greater than 0;
Designation in figure: U
in---input voltage; S1-S12---the first switching tube closes pipe to twelvemo; W
1---high-frequency isolation transformer former limit winding; W
2---high-frequency isolation transformer vice-side winding; i
w1---high-frequency isolation transformer former limit input current; u
w1---high-frequency isolation transformer original edge voltage; i
w2---high-frequency isolation transformer secondary output current; u
w2---high-frequency isolation transformer secondary voltage; u
r---synchronous rectifier output voltage; u
t---power frequency inverter output voltage; i
l1---power frequency inverter output current; u
o---output voltage after high-frequency chain inverter filtering; u
g---line voltage; L
1, L
2, C---LCL filter inductance, capacitance; u
gf---line voltage value of feedback; i
ref---grid-connected current reference value; i
lf---high-frequency chain inverter output current value of feedback; i
e---grid-connected current feedback error signal; i
r1---duty-cycle loss compensating signal; i
r2---grid-connected current closed-loop adjustment outputs signal; i
r---high-frequency chain inverter sinusoidal modulation signal; u
s1~ u
s12---the drive singal of switching tube S1 ~ S12; | i
r|---high-frequency chain inverter exports the absolute value signal controlling conditioned signal; T1CTR ~ T3CTR---the clocking value of DSP Timer T1 ~ T3; T3PR---the periodic quantity of DSP Timer T3; CMP1R ~ CMP2R---DSP Timer T1 ~ T2 increases the comparison value of timing; CMP1D ~ CMP2D---DSP Timer T1 ~ T2 subtracts the comparison value of timing.
Embodiment
Below in conjunction with specific embodiment, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
As shown in Figure 1, rectifier type high-frequency chain inverter comprises input voltage U
in, Sine Modulated high-frequency inverter, high-frequency isolation transformer T, synchronous rectifier, power frequency inverter and LCL filter, below put up with its interconnected relationship and building block is described in detail.
Sine Modulated high-frequency chain inverter adopts phase-shift control mode, phase shift angle is the change of sinusoidal rule, comprise the power MOSFET of the anti-also diode of band, label is respectively S1-S4, the source electrode of S1 is connected with the drain electrode of S3, the source electrode of S2 is connected with the drain electrode of S4, and the drain electrode of S1 connects the drain electrode of S2, and the source electrode of S3 connects the source electrode of S4; The positive pole of input power is connected between the drain electrode of S1 and the drain electrode of S2; The negative pole of input power is connected between the source electrode of S3 and the source electrode of S4.
Synchronous rectifier adopts band anti-and the insulated gate bipolar transistor of diode is formed, label is respectively S5-S8, and the emitter of S5 is connected with the collector electrode of S7, and the emitter of S6 is connected with the collector electrode of S8, and the collector electrode of S5 connects the collector electrode of S6, the emitter of S7 connects the emitter of S8.
High-frequency isolation transformer T comprises former limit winding and vice-side winding, wherein transformer primary side winding is two terminals, be respectively the 1st terminal, the 2nd terminal, transformer secondary winding also has two terminals, be respectively the 3rd terminal, the 4th terminal, wherein transformer the 1st connecting terminals is connected between the source electrode of S1 and the drain electrode of S3, and transformer the 2nd connecting terminals is connected between the source electrode of S2 and the drain electrode of S4; Transformer the 3rd connecting terminals is connected between the emitter of S5 and the collector electrode of S7, and transformer the 4th connecting terminals is connected between the emitter of S6 and the collector electrode of S8.
Power frequency inverter adopts band anti-and the insulated gate bipolar transistor of diode is formed, label is respectively S9-S12, the emitter of S9 is connected with the collector electrode of S11, the emitter of S10 is connected with the collector electrode of S12, and the collector electrode of S9 connects the collector electrode of S10, the emitter of S11 connects the emitter of S12.In addition, in synchronous rectifier and power frequency inverter T, the collector electrode of S5, the collector electrode of S6, the collector electrode of S9, the collector electrode of S10 interconnect; The emitter of S7, the emitter of S8, the emitter of S11, the emitter of S12 interconnect.
Inductance L in LCL filter
1one end and the emitter of S9, the collector electrode of S11 link together, inductance L
1the other end and one end of filter capacitor C and inductance L
2one end connect; Inductance L
2the other end be connected with the live wire of electrical network; The other end of filter capacitor C and electrical network zero line, the emitter of S10 and the collector electrode of S12 link together.
The numerical control system of rectifier type High Frequency Link combining inverter, comprises voltage sensor, current sensor and DSP digitial controller; Wherein DSP digitial controller comprises phase-locked loop, subtracter, duty-cycle loss calculating, grid-connected current adjuster, adder and signal conditioner composition;
The input of voltage sensor is connected to the two ends of above-mentioned electrical network, and current sense input and above-mentioned first inductance are in series;
The output voltage u of voltage sensor
gfconnect the input of phase-locked loop, the output current i of phase-locked loop
refconnect the positive input terminal of subtracter, be used as the fiducial value of grid-connected current; The output current i of current sensor
lfbe connected to the value of feedback of negative input end as grid-connected current closed loop of subtracter, current i
refdeduct current i
lfobtain the error current i of grid-connected current closed loop
e, i
eas the input current of grid-connected current closed-loop regulator, the output current i of grid-connected current closed-loop regulator
r2; The output current i of current sensor
lfas the input signal of duty-cycle loss computing module, being used for computed duty cycle loses size respective signal i
r1; By i
r1with i
r2summation obtains the sinusoidal modulation signal i of high-frequency chain inverter
r; By signal i
ras the input signal of switching tube drive singal conditioner, and the drive singal u of switching tube drive singal conditioner output switch pipe S1-S12
s1~ u
s12.
Signal madulation schematic diagram corresponding to the signal conditioner in Fig. 1 as shown in Figure 2, by conditioned signal i
rtake absolute value and obtain signal | i
r|, and will | i
r| as the modulation signal data of Sine Modulated high-frequency chain inverter switching tube drive singal.In DSP digitial controller, signal madulation amounts to employing 3 timer T1-T3, and these 3 timer synchronization increase, subtract timing, and the cycle is identical, and namely T1PR=T2PR=T3PR, T1, T2 are when increasing timing, and the value of corresponding comparand register is
CMP1R＝0.5×i
r(1)
CMP2R＝T2PR-0.5×i
r(2)
T1, T2 are when subtracting timing, and the value of corresponding comparand register is
CMP1D＝T2PR-0.5×i
r(3)
CMP2D＝0.5×i
r(4)
As shown in Figure 2, according to the modulator approach of (1)-(4) formula, obtain the drive singal of switching tube S1-S4, then the output voltage u of the Sine Modulated high-frequency inverter obtained
w1there is the high-frequency alternating current of the characteristic of sinusoidal wave rule change.The value of the comparand register of timer T3 is the half in its cycle, obtains the drive singal of switching tube S5-S8, for ensureing that synchronous rectifier normally works, must ensure at u
w1voltage is timing, and the drive singal of switching tube S5 and S8 is high level, at u
w1voltage is for time negative, and the drive singal of switching tube S6 and S7 is high level; In the power frequency inverter of synchronous rectifier rear class, switching tube S9-S12 is operated in power frequency synchronous regime, and its power frequency change of current is by conditioned signal i
rpolarity determined, i
rpolarity is timing, and the drive singal of switching tube S9 and S12 remains high level, i
rpolarity is for time negative, and the drive singal of switching tube S10 and S11 remains high level; Must note, according to the schematic diagram of signal madulation shown in Fig. 2, the count value that time from switching tube S9, S12 to switching tube S10 and S11 occurs in timer T1-T3 is that periodic quantity obtains half, and now, transformer prime Sine Modulated high-frequency inverter output voltage is zero.
In the present invention, rectifier type high-frequency chain inverter is applied to grid-connected, realizes unity power factor, i.e. inverter output voltage u during normal work
owith filter inductance current i
l1polarity only have two kinds of situations, respectively: 1. i
l>0, u
o>0; 2. i
l<0, u
o<0.Under both of these case, energy is all flow to grid side from the DC side of input, and the unique difference of the mode of both of these case circuit working is the operating state of power frequency inverter, i
l>0, u
oduring >0, switching tube S9 and S12 is open-minded, i
l<0, u
oduring <0, switching tube S10 and S11 is open-minded.For the synchronous rectifier of prime and the operating state of Sine Modulated high-frequency inverter, both of these case is consistent.In view of the foregoing, only the first working condition corresponding to the present invention is carried out labor below.
I
l>0, u
oduring >0, the waveform in a switch periods as shown in Figure 3, when analysis circuit specific works mode, needs the leakage inductance L considering transformer primary avris
rand the junction capacitance of switching tube S1-S4, therefore add the leakage inductance L of transformer primary side winding in corresponding modal graph
rwith the junction capacitance of switching tube S1-S4:
Switch mode 0 [corresponding diagram 4]:
Switching tube S1 and switching tube S4 conducting, primary side current of transformer is through S1, transformer leakage inductance L
r, transformer primary side winding and S4; Transformer secondary voltage is just, secondary current is through the anti-also diode of synchronous rectifier breaker in middle pipe S5, S8, and power frequency inverter breaker in middle pipe S9 and S12.
Switch mode 1 [corresponding diagram 5]:
T
0in the moment, switching tube S1 turns off, the leakage inductance L of transformer
r, filter inductance L
1with the junction capacitance resonance of switching tube S1, S3, due to filter inductance L
1value is very large, so switching tube S1 both end voltage linearly rises, switching tube S3 both end voltage linearly declines, and therefore S1 is zero voltage turn-off; The current path of transformer secondary is consistent with switch mode 0.
Switch mode 2 [corresponding diagram 6]:
T
1in the moment, the terminal voltage of switching tube S3 drops to 0, its anti-and diode no-voltage conducting, and primary voltage of transformer drops to 0, the change of its current following transformer secondary side current and changing; The current flow paths of transformer secondary is the same with switch mode 1.Attention: in this mode, t
2in the moment, open S3, then S3 is that no-voltage is open-minded; t
3near moment, rectifier bridge switching tube S5, S8 of transformer secondary circuit and switching tube S6, S7 have the time of one section of overlapping conducting, but i
l>0, does not affect the switch mode of circuit.
Switch mode 3 [corresponding diagram 7]:
T
4in the moment, S4 turns off, and the junction capacitance generation resonance of transformer primary side leakage inductance and switching tube S2 and S4, the terminal voltage of S4 rises gradually, and therefore S4 is zero voltage turn-off.Once S4 turns off, transformer voltage change is negative, then the anti-also diode current flow of S6, S7 of secondary, and the anti-also diode of switching tube S5, S8 continues conducting, transformer secondary voltage u
w2again be 0 by clamper, then the voltage of S4 junction capacitance acts on the leakage inductance L of transformer
ron, the electric current decline of transformer primary side, causes the anti-of switching tube S5, S8 and in diode, electric current declines, and in the anti-also diode of S6, S7, electric current rises gradually.In this stage, primary voltage of transformer is less than zero, and transformer secondary voltage equals zero, and causes the loss of duty ratio.
Switch mode 4 [corresponding diagram 8]:
T
5in the moment, the terminal voltage of S2 and S4 becomes 0 and input voltage U respectively
in, the anti-also diode current flow of S2.T
6in the moment, primary side current of transformer drops to 0.In this period of time, S2 is open-minded, and therefore S2 no-voltage is open-minded.During this period of time, transformer secondary duty ratio continues to lose.
Switch mode 5 [corresponding diagram 9]:
T
6in the moment, primary side current of transformer drops to 0, and two branch currents of transformer secondary rectification circuit are equal.After this primary current oppositely increases, but is not enough to provide load current completely, and in secondary circuit, the anti-also diode current of S6, S7 starts to be greater than the electric current flowing through the anti-also diode of S5, S8.During this period of time, transformer secondary duty ratio continues to lose.
Switch mode 6 [corresponding Figure 10]:
T
7in the moment, in secondary circuit, S5 is anti-and the electric current of diode becomes 0, filter inductance current i
lcomplete the conversion from the anti-also diode of S5 to the anti-also diode of S6.From t
7in the moment, transformer secondary voltage becomes negative, and duty-cycle loss stops.
T
8after moment, converter starts the work in second cycle, and analytic process is similar.
As can be seen from above-mentioned modal graph, from moment t
2to moment t
7duty-cycle loss phenomenon is there is in transformer secondary output voltage relative to former limit winding voltage, as the Δ d in Fig. 3, due in high-frequency chain inverter of the present invention, realize in the inverter of Sine Modulated in transformer primary side circuit, therefore, this duty-cycle loss will have influence on the quality of high-frequency chain inverter output waveform, makes in output voltage containing a large amount of harmonic waves.For improving the output voltage quality of high-frequency chain inverter of the present invention, spy increases duty-cycle loss computing module in dsp, calculated value is added to power network current adjuster output signal in go, to compensate the voltage distortion that duty-cycle loss causes, thus cause the decline of grid-connected current quality.The size of duty-cycle loss computing module output signal is:
In formula, K be transformer primary side umber of turn than the upper vice-side winding number of turn, T
sfor the switch periods of high-frequency chain inverter, T1PR is the digit period of timer T1.After offset shown in formula (5) is superposed with the output signal of grid-connected current closed-loop regulator, as the reference signal of Sine Modulated, effectively can reduce the harmonic wave of inverter output voltage, greatly improve the quality of grid-connected current.
In sum, the present invention adopts three bridge circuits to achieve by the conversion of direct current to alternating current, compared with conventional highfrequency chain inverter, eliminates the DC filter that volume and weight is all larger; Carry out in the inverter of Sine Modulated in transformer primary side circuit, synchronous rectifier rear class inverter can be realized and only adopt power frequency switch motion, reduce switching loss; In addition, in synchronous rectifier and power frequency inverter, all switching tubes all achieve zero voltage switch, reduce further the loss of high-frequency chain inverter; Utilize duty-cycle loss computing module, do not increasing on the basis of hardware cost, improve the quality of high-frequency chain inverter output voltage waveforms.Therefore the present invention has volume, weight is little, and efficiency is high, and cooling requirements is low, the advantage that grid-connected current quality is high.
Claims (2)
1. the digital control system for the output digital modulation circuit of rectifier type High Frequency Link combining inverter
System, is characterized in that: the output digital modulation circuit of rectifier type High Frequency Link combining inverter, comprises input voltage U
in, Sine Modulated high-frequency inverter, high-frequency isolation transformer, synchronous rectifier, LCL filter and power frequency inverter;
Described Sine Modulated high-frequency inverter comprises the first switching tube, second switch pipe, the 3rd switching tube and the 4th switching tube of being with anti-also diode, the source electrode of the first switching tube is connected with the drain electrode of the 3rd switching tube, the source electrode of second switch pipe is connected with the drain electrode of the 4th switching tube, and the drain electrode of the first switching tube connects the drain electrode of second switch pipe, the source electrode of the 3rd switching tube connects the source electrode of the 4th switching tube; The positive pole of input power is connected with the drain electrode of second switch pipe with the drain electrode of the first switching tube; The negative pole of input power is connected with the source electrode of the 4th switching tube with the source electrode of the 3rd switching tube;
Synchronous rectifier comprises the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube of being with anti-also diode, the emitter of the 5th switching tube is connected with the collector electrode of the 7th switching tube, the emitter of the 6th switching tube is connected with the collector electrode of the 8th switching tube, and the collector electrode of the 5th switching tube connects the collector electrode of the 6th switching tube, the emitter of the 7th switching tube connects the emitter of the 8th switching tube;
High-frequency isolation transformer comprises former limit winding and vice-side winding, wherein transformer primary side winding is two terminals, be respectively the first terminal, the second terminal, transformer secondary winding also has two terminals, be respectively the 3rd terminal, the 4th terminal, wherein transformer the first terminal is connected with the drain electrode of the 3rd switching tube with the source electrode of the first switching tube respectively, and transformer second terminal is connected with the drain electrode of the 4th switching tube with the source electrode of second switch pipe respectively; Transformer the 3rd terminal is connected with the collector electrode of the 7th switching tube with the emitter of the 5th switching tube respectively, and transformer the 4th terminal is connected with the collector electrode of the 8th switching tube with the emitter of the 6th switching tube respectively;
Power frequency inverter comprises is with the 9th switching tube of anti-also diode, the tenth switching tube, the 11 switching tube and twelvemo to close pipe, the emitter of the 9th switching tube is connected with the collector electrode of the 11 switching tube, the emitter of the tenth switching tube is connected with the collector electrode that twelvemo closes pipe, and the collector electrode of the 9th switching tube connects the collector electrode of the tenth switching tube, the emitter of the 11 switching tube connects the emitter that twelvemo closes pipe; In addition, in synchronous rectifier and power frequency inverter, the collector electrode of the 5th switching tube, the collector electrode of the 6th switching tube, the collector electrode of the 9th switching tube, the collector electrode of the tenth switching tube interconnect; The emitter that the emitter of the emitter of the 7th switching tube, the emitter of the 8th switching tube, the 11 switching tube, twelvemo close pipe interconnects;
In LCL filter, one end of the first inductance and the emitter of the 9th switching tube, the collector electrode of the 11 switching tube link together, and the other end of the first inductance is connected with one end of one end of filter capacitor and the second inductance; The other end of the second inductance is connected with the live wire of electrical network; The collector electrode that the emitter of the other end of filter capacitor and electrical network zero line, the tenth switching tube and twelvemo close pipe links together;
The numerical control system of rectifier type High Frequency Link combining inverter comprises voltage sensor, current sensor and DSP digitial controller; Wherein DSP digitial controller comprises phase-locked loop, subtracter, duty-cycle loss computing module, grid-connected current adjuster, adder and signal conditioner composition;
The input of voltage sensor is connected to the two ends of above-mentioned electrical network, and current sense input and described first inductance are in series;
The input of the output termination phase-locked loop of voltage sensor, the positive input terminal of the output termination subtracter of phase-locked loop, the output of current sensor is connected to the negative input end of subtracter and the input of duty-cycle loss computing module, the input of the output termination grid-connected current adjuster of subtracter, two inputs of adder connect the output of duty-cycle loss computing module and the output of grid-connected current adjuster respectively, the first terminal of the output termination signal conditioner of adder, second terminal of signal conditioner exports the first switching tube, second switch pipe, the drive singal of the 3rd switching tube and the 4th switching tube, 3rd terminal of signal conditioner exports the 5th switching tube, 6th switching tube, the drive singal of the 7th switching tube and the 8th switching tube, 4th terminal of signal conditioner exports the 9th switching tube, tenth switching tube, 11 switching tube and twelvemo close the drive singal of pipe,
The size of duty-cycle loss computing module output current signal is:
In formula, K be transformer primary side umber of turn than the upper vice-side winding number of turn, T
sfor the switch periods of High Frequency Link combining inverter, T1PR is the digit period of the timer T1 of DSP digitial controller, i
lffor current sensor output current, U
infor input voltage, L
rfor transformer leakage inductance size.
2., as claimed in claim 1 for the numerical control system of the output digital modulation circuit of rectifier type High Frequency Link combining inverter, it is characterized in that:
First adopt the feedback signal of voltage sensor senses line voltage, utilize phase-locked loop to obtain the fiducial value of the grid-connected current synchronous with line voltage, the amplitude of this fiducial value obtains according to the maximal power tracing point of generation of electricity by new energy device; Adopt current sensor to detect the first inductor current feedback signal, by phase-locked loop gained reference signal and the first inductor current feedback signal subtraction, obtain grid-connected current error signal, using the input signal of grid-connected current error signal as grid-connected current adjuster; Owing to there is the loss of duty ratio in main circuit, for obtaining output waveform, obtain current signal i according to current sensor output current by duty-cycle loss computing module
r1, then by described current signal i
r1with grid-connected current regulator output signal i
r2be added, finally obtain the modulation signal i of High Frequency Link combining inverter
r, so improve the output quality of grid-connected current.
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| CN103986317A (en) * | 2014-05-29 | 2014-08-13 | 深圳市英可瑞科技开发有限公司 | Filter circuit with power frequency output |
| CN105610290B (en) * | 2016-01-19 | 2018-01-12 | 南京航空航天大学 | A kind of low noise Induction Motor System, control system and control method peculiar to vessel |
| CN106981995B (en) * | 2017-04-24 | 2019-04-02 | 华北电力大学 | The minute design method of high frequency transformer voltage, current transfer ratio |
| CN108448898B (en) * | 2018-03-29 | 2019-10-11 | 合肥工业大学 | LLC based on phase shifting angle feedforward is without sensor synchronous rectification control method |
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| CN101820230A (en) * | 2010-02-26 | 2010-09-01 | 韩新建 | High-frequency isolation type grid-connected inverter |
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| CN101071948A (en) * | 2007-03-29 | 2007-11-14 | 上海大学 | High-efficiency single-phase and three-phase grid-connected generating system |
| CN101820230A (en) * | 2010-02-26 | 2010-09-01 | 韩新建 | High-frequency isolation type grid-connected inverter |
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